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FintechReact NativeTypeScript

Mobile Banking App Modernization

70% Improvement
Key Performance Metric

Project Overview

Client:Major North American Bank
Industry:Fintech
Duration:24 months
Team Size:Mobile Development & Security Team

Challenge

A major North American bank needed to modernize its mobile banking app, which suffered from sluggish performance and inconsistent UX, outdated authentication mechanisms, low test coverage and frequent production bugs, and limited support for cross-platform feature parity. The goal was to deliver a secure, fast, and scalable mobile experience with full device support and strong governance.

Our Solution

We re-architected the app using a modern tech stack and DevOps best practices.

App Architecture Overhaul

Migrated to React Native for shared codebase across iOS and Android. Adopted Redux for predictable state management. Refactored components using TypeScript for better maintainability and type safety.

Security Enhancements

Implemented JWT-based authentication with token refresh workflows. Integrated biometric authentication using native modules. Improved API security through secure headers and encrypted storage.

Testing & Reliability

Achieved 98% test coverage using Jest and Detox. Built unit, integration, and end-to-end tests. Implemented CI/CD workflows for automated validation.

Performance Optimization

Reduced app load time with lazy loading and image caching. Minimized memory footprint and improved crash stability. Streamlined UX across flows like payments, fund transfers, and notifications.

Results

35% Faster App Load Time

Achieved significant improvement in app load time on both iOS and Android through performance optimization and modern architecture.

70% Fewer Production Bugs

98%+ test coverage led to dramatic reduction in production issues and improved app stability.

4.8★ App Store Rating

Achieved high user satisfaction with 4.8-star rating after re-launch through improved user experience and reliability.

Faster Feature Delivery Cycles

Enabled faster feature delivery cycles with modular code architecture and comprehensive CI/CD implementation.

What Our Client Says

"
Kooe helped us deliver the kind of banking experience our users expect in 2024 — fast, secure, and frictionless.
VP, Mobile Banking Technology
Major North American Bank

Technologies Used

Frontend & Backend

React NativeTypeScriptReduxJWT AuthenticationBiometricsOAuthJest

Infrastructure & Tools

DetoxREST APIsAxiosSecure StorageCI/CD PipelinesCodePush

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